Diaphragm attachment



l. E. JONES. mAPHRAGM ATTACHMENT. APPLICATION FILED IUNE 18, 1920.

Patented May 9, 192.2.

IN VEN TOR.

I ATTORNEY.'

PATENT orifice.

JOSEPH E. JONES, O'F WALTHAM, MASSACHUSETTS.

DIAPHRAGM ATTACHMENT.

Specification of Letters Patent.

Patented May 9, 1922.

Application filed June 18, 1920. Serial No. 389,927.

To all 107mm 'it may concern:

Be it known that I, JosErI-r E. JONES, a citizen of the United States, residing at Waltham, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Diaphragm Attachments7 of which the following is a specification. y Y

This invention relates to diaphragm atconnection with such diaphragm constructions as used upon the Edison phonograph.

Another object of this invention is the production of a very simple and efficient means for attaching the cord to the diaphragm in such a manner as to permit the cord to be released from the diaphragm when so desired and replaced should occasion arise.

With these and other objects in view this invention consists of certain novel construction, combination and arrangement` of parts as will be hereinafter fully described in claims. In the drawing:

Figure 1 is a top plan view of the diaphragm.

Figure 2 is a bottom plan view thereof.

Figure 3 is a central transverse sectional view through the diaphragm.

Figure 4 is a top plan view of a modified form of the diaphragm which will he known as the friction cone construction.

Figure 5 is a bottom plan view of the diaphragrn attachment shown in Figure 4, and

Figure 6 is a central transverse sectional view through the diaphragm.

By referring to the drawings it will be seen that 1 designates the diaphragm which may be formed of any suitable or desired material or construction such for instance as is employed upon the usual Edison type of reproducers employed upon phonographs and the like. A reinforcing disc 2 formed of cork or other suitable material is secured to the underface of the diaphragm disc 1 and a threaded plug 3 is passed through the center of the disc 2 as clearly shown in Figure 3. This threaded plug 3 is externally threaded and receives a cone 4, which is internally threaded as indicated at 5, so as to` permit the cone 4 to be firmly threaded upon the plug 3 and in this way hold the diaphragm disc 1 in firm engagement with the inner face 6 of the reinforcing disc 2. This cone 4 may he formed of celluloid, glass or other suitable material without departing from the spirit of the invention.

ing movement from the tachments, especially designed for use in" ture 10 formed in the cone 4 and receives a nut 11 for the purpose of firmly binding the cone 4 in a set position against unthreadplug 3. The cord 12 is extended from the shank 7 and any suitable or desired connecting means may be carried by the cord for permitting the sameto'he readily attached to the needle carrying arm of the reproducer. y

In Figures 4, 5 and 6 there 4is shown a vmodiiied form of the invention wherein the usual disc 1a is employed having the reinforcing disc 2a secured to the underface ot the disc la. A friction cone 3a extends centrally through the disc 1a and 2a and this cone 3a is provided with a laterally extending flange 13 uponits inner end for iirmly holding the disc 2a in engagement with the disc 1a. This cone 3a is provided with a shoulder portion 14 and a reduced aperture formed near the inner end. A cord supporting shank 16 supports the cord 17 of the usual construction and this shank 16 is prou vided with an internally aperture 18 at one end for the purpose of receiving the threaded shank 19 of the securing screw 20. A friction cone 21 iits over the cone 3a and is provided with a substantially conical shaped socket 22 for frictionally receiving and gripping the cone 3EL as clearly shown in Figure 6. The screw 2O ,is adapted to extend through the upper end of the cone 21 and fit snugly within the internally threaded aperture or socket 18 of the cone 3a as shown in Figure 6 for frictionally holding the cone 21 in firm engagement with cone 3 and at the same time causing the lower end 23 to firmly bind the diaphragm disc 1a in engagement with the adjoining face of the disc 2,

In the foregoing description it will he seen that a very simple means has been produced whereby the diaphragm disc 1 and 1a may loe firmly held in an assembled position so as to produce the desired results without the necessity of holding the same in engagement with each other by the usual method such as waX or other soldering medium. It, of course, is obvious that should the cords l2 or 17 become broken, the same may loe readily replaced. It should also he understood that the means of attaching the cord to the diaphragm Will prevent the cords from being accidentally detached from thevdiaphragm,

lthereby constituting a permanent and efficient securing means therefor. It has been found by actual experience that the attachment of the cords to the diaphragm disc in the manner set forth, Will not only increase the life of the diaphragm, but will also greatly increase the Volume as Well as improve the tone.

It, of course, should be understood that certain detailed changes in mechanical construction may be employed Without departing from the spirit of the invention so long as these changes fall Within the scope of the ap uended claims.

I hat I claim is:

l. A diaphragm attachment comprising a diaphragm disc, a threaded plug extending through said disc a cone carried by saidplug, a cord, a .shank engagingsaid cord and .f1t-

l ting Within said plug, a disc engagingilange clamping said disc in a set position, and means connected to said cord engaging shank and engaging said cone for locking said cone upon said plug.

2. A diaphragm attachment of the class described, comprising a diaphragm disc, a reinforcing disc secured thereto, an ext-ernally threaded plug extending centrally i' through said reinforcing disc and diaphragm disc, a cone threaded upon said externally threaded plug, a cord engaging shank mounted Within said plug and provided with a threaded extension projecting through said yplug and the upper end of said cone, and a nut threaded upon the outer end of said extension for firmly clamping said cone against movement of said plug, whereby said cone Will firmly bind said diaphragm disc into engagement with said reinforcing disc.

In testimony whereof I aHX my signature in presence of two Witnesses.

JOSEPH E. JONES.

Vitnesses JOHN R. GILBERT, THOMAS F. MCCARTHY. 

